In the fall of 2012, Microsoft made Windows Server 2012 generally available with a quietly announced feature: Resilient File System (ReFS). Of course, Microsoft does not roll out new file systems casually, and when they do, the ripple effects are generally felt slowly. NTFS has been generally available since Windows NT 3.1, released in 1993. If one runs a data center of any size, swapping out the underlying file system of critical or precious data is not a decision taken lightly. In large part, this justifies a general complacence in our field of digital forensics tools when considering how to deal with this new file system. Today, ReFS is a rare bird: investigators just don’t see it very often. We think that is going to begin to change later this year.